20123515055 has 16 divisors (see below), whose sum is σ = 27705360960. Its totient is φ = 13745283072.

The previous prime is 20123515001. The next prime is 20123515103. The reversal of 20123515055 is 55051532102.

It is a cyclic number.

It is not a de Polignac number, because 20123515055 - 2¹⁸ = 20123252911 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1109600 + ... + 1127589.

It is an arithmetic number, because the mean of its divisors is an integer number (1731585060).

Almost surely, 2^20123515055 is an apocalyptic number.

20123515055 is a deficient number, since it is larger than the sum of its proper divisors (7581845905).

20123515055 is a wasteful number, since it uses less digits than its factorization.

20123515055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237458.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 20123515055 in words is "twenty billion, one hundred twenty-three million, five hundred fifteen thousand, fifty-five".